JUnit report parsing cannot handle nested suites

Details

Description

JUnit allows to nest testsuites indefinetly (using TestSuite.addTestSuite()) which results in xml files that have <testsuites> element as root and under that a hierarchy of <testsuite> elements. Currently the SuiteResult class in Hudson can only handle a single level of nesting, which results in the "None of the test reports contained any result" error in the build.